Spring-cushion fork structure for motor-cycles.



F. H. POMMER. SPRING CUSHION FORK STRUQTURE FOR MOTOR CYCLES APPLICATION FILED SEPT. 8, 1910.

980,999, Patented Jan. 10,1911

use

ii a illustrate the invention,

' UNITED STATES PATENT OFFICE.

rnnn H. roMMER, 0F MINNEAPOLIS, MINNESOTA:

SPRING-CUSHION ronK STRUCTURE 30R MOTOR-CYCLES.

new and useful Improvements in 'Sprmg- Cushion Fork Structures for-Motor-Cycles; and I do hereby-declare, the following to be a full, clear, and exact description of the in- ,vention, such as will enable others skilled in the art to which the same. I I lyinvention' relates particularly to motor es and has for its object to provide'an proved spring cushion fork structure therefor. I 4

To the above ends,- theinventionconsists of the novel devices and combinations of devices hereinafter described and defined in the it appertains tolmake and:

claims. a

In the accompanyin drawings, which like characters indicate like parts throu hout the several views. Referring to the drawings, Figure -1 is-a view in side elevation, with 'some 'parts broken away and some parts'rei'noved, show-' ing the frontportion of the motor cycle; Fig. 2 is a front elevation, with some-parts sectioned, on the linemp'fia: of Fig. 1,1' and with some vparts brokenaway; Fi 3 is a section taken on the line m n) "0 Fig. 2 some parts being broken awalyand the arts I being shown on alarger scae than in igs. 1 and 2 and Fig. 4' is an approximately horizontal section taken-through oniside of the fork strncture,- on theline a) a? of Fig. 1. The numeral 1' indicates the motor cycle I frame which, at its front end, .is provided.)

with the customary fork socket 2, in which the stem of the front fork' 3 is jonrnaledin' the usual way, being provided 'with thecust'omary handle bar posts 4 to which the handle bars 5 aresecured. The le of the fork 3 are made up of telescopic sections, the

lower end members 3 of" which telescope into the upper or main'sections of the said fork legs. The front wheel 6 is' journaled in theusual or any suitable Way on a spindle or axle 7 which is rigidly secured to and connects the lower ends of the movable fork sections 3. t

Levers 8are interinediately pivoted at 9 I to the intermediate portions of the movable lower end sections 3 of the fork legs, and

' Specification of Letters Patent. Patented Jfill. 10, 1911.

s, 1910. Serial No. 581,008.'

are connected by links 10 to lugs 11 secured to and projecting rearward from the crown 'of the fork3. The bracket 12 is also rigidly secured to the crown of the fork 3 and projects forwardly therefrom. The relatively long'front ends of the levers 8 are pivotally connected to the lower ends of the prongs ofa U-shaped link 13 that works through and is guided by the said bracket 12. A heavy coiled tension spring 14 is' anchored,

to the crown of the said U-shaped or forked link 13.

the bracket 12, to which a lamp is adapted to be applied, but which, however, constitutes ,no part of the present invention.

tached to the crown of the fork 3.and, as

straps18f I I The. weight of the machine frame and parts carried thereby is, of course, carried partly on the rear wheel and partly on .the front wheel thrdu'gh the front fork structure. The weiglftQon the front fork strucmovement of the fdrk legs and, in this way,

mgly increased-and is made more sensitive. The friction of the telescopic engagement between the'sections'of the fork prongs may be reduced to a minimum bylubrication preferably afforded by hard oil placed within the upper portions of the outer telescopic sections of the said fork sections.

The construction above described affords a highly etiicient cushion or spring connec tion between the front wheel and the st'eering fork and makes the machine extremely ordinary shocks incident to travel over rouglrrpads:- "Furthermore, the improved 'fspring-fork structure is of comparatively small cost and is durable. These statements I have been demonstrated by the actual use of a fork structure designed as shown in the drawings. ,1

What I claim is: 1. In a machine of the kind described, the combination ,with a fork having axially the relatively short rearfends of these levers movable lower end sections, levers pivoted The numeral 16 indicates an extension of- The numeral 17 indicates a mud guard atshown, conncted to the links 10 by metal- ,ture is carried tlnli ongh the spring 14-, butthe lovers 8 multiply the movement of the, I spring as compared :with the. .telescopic I at its lower end, to the bracket 12, and, at 2 its upper end, is attached by a coupling 15 the power of the said spring is correspond easy riding and but slightly sensitive to the to the latter, links eonnectin said levers to the upper fork structure, an asprin 'con- 'nection, independent of said links an said fork, between the said levers and the saidupper fork structure. a

2. In a machine of the kinddescribed, the combination with a forkhaving's axially movable lower end sections, levers interme-- diately pivoted to the latter, links connect- 'ing the rear ends of the said levers to the 11 per fork structure, and a. spring connection between the front ends of. said levers and-the said upper forkstructure.

3. In a machine of the kind described, the

combination with a fork' having axially niovable lowerendsections, levers intermediately pivoted to the.1atter,-1inks connecting' the'rear-ends of said levers to the upper;

-fork structure, a 'forked link connected to v the front ends of said leversand guided by the upper fork structure, and. a. tension spring anchored to 'the upper fork structure I and to the upper portion of the said forked link. l

,endsof said levers to the upper tb'rk structure, a'braeket rigidly secured to and projecting-forward from the upper fork struc-- ture, a .U-shaped link guided y said bracket and attached to the -front ends of said levers, and a tension s ring anchored to' the said 'bracketand. to t e crown of the upper portion ofsaid-.,U-sl 1aped link, substantially as described. I r I In-testimonv whereof I afiix my signature in presence '0 two witnesses.

FRED POMMER.

Witnesses:

' ALiCE V. SWANSON, -HARRY'VD. Kneon". 

